Pressure-indicator.



W. SEYMOUR. PRESSURE INDICATOR. AP PLICATION FILED 00T. 26, 1909.

. 1,037,550, Patented sept. 3; 1912.

UNITED sTATEs PATENT OFFICE.

WILLIAin sEYisIoUn'oF enema" RAPIDS, MICHIGAN.

rnEssUnaIi/amouon.

item50.

Specicatien ofpLette'rs Patent.v Patented SephS, 1912.

application med center 26, 1909. serial No. 524,722.

To all 'whom it concern Be it known that I, WILLIAM SEYMoUn, a citizen of the United States of America, re-

" siding at Grand Rapids, in the county of C pressure devices mains; and its object is to provide a device that will correctly indicate the pressure in a gas4 main or other analogous .device at some distant point by means-of an index upon a dial; and it consists essentially o f -a battery and volt meter conveniently located,

an electrical circuit extending fro-m the volt meter and battery to some distant point near where the main is located, the pressure in which is to be indicated, a variable electrical resistance in the circuit and means for varying the resistance, operated by the varying pressure in the main, and in various features 'of combination and arrangement as will more fully appear by reference to the accompanying drawings, in` which Figure l is a diagrammatic representation ofa device embodying my invention; and,

Fig. 2 a vertical section of a portion of the device, together with the inclosingA case shown on an enlarged scale. 'Y Like numbers refer to like parts in both of the figures.

v. 1 represents a portion of a gas main or other devicecontaining atluid under pressure; 2 a case to contain the variable) resistance apparatus; 3 a volt meter located at any dist-ant and convenient point for observation where it is desiredv to indicate the pressure in the main 1;' 4 a battery or other source of constant electricalenergy; 5 an electrical circuit connecting the battery and volt meter in series with the variable reslstance apparatus in the case 2, hereafter described. n K

6 Is a pipe or conduit colnmunicatlng with the main l at one end and extending within the case 2 and communicating. with a `closed vessel 7 within the case. 8 1s any other vessel within the case, preferably ele-` vat'ed above the level of the vessel 7, and

communicatin therewith at the bottom of each by a con uit 9. -These two vessels are preferably of glass or other like material and integrally connected by an integral conduit 9. The vessel 8 is preferably of truncated conical form to conform to the divergin form of the contained conductors 11 w "ich are preferably platinum wires supportedl upon diverging arms 12 near the opposite sides of the vessel 8. These arms are preferably of glass cr other insulating material and the wires arranged in the same plane and diverging downward from each other terminate apart near the bottom of `ythe vessel and are extended upward through the closure of the vessel, and thence connected to the respective positive and negative conductors of 'the circuit 5. They thus constitute diverging terminals inclosed within'the vessel 8. .These wires are pref' erably extended `through tubes in the closurev which tubes are large enough to form vents to permit t-he How of air" therethrough to avoid air pressure from modifying the action of the device. However for high'pressures these tubes may be sealed, in which case the inclosed air would operate as a spring to change the reading to high er pressures.

l0 represents any convenient Huid having the. desired electrical resistance to properly v modify the voltage of the current as hereafter explained. I prefer touse in this device a dilute solution of sulfuric acid in distilled water, but do not limit vmyself in this respect, any iuid having resistance to electric currents may be used.

The volt meter 3 is preferably provided with a modified scale over which the index traverses to indicate pressures in inches of water in the main, this scale being calibrated relative to the rise and fall of the voltage of the current passing through the meter as will easily be understood without further explanation.

In operation the pressure in the vessel 7 rises and falls in common with that in the main 1. This pressure as it increases forces `more of the fluid 10 out of the vessel 7 into the vessel 8, which tendsby gravity to return to-the vessei 7. As the fluid rises in the vessel 8, the resistance decreases by virtue of the decrease in the'gap` between the i wires at the surface of the fluid and also to an increased sublnergence-` ofthe wires 11 therein.- The voltage of the current willthus increase in proportion to the diminution of resistance in this gap. This Will, of course, operate to move the index of the volt meter over the scale, Which being properly calibrated Will accurately indicate the changes in ,pressure in the main l upon the'scale of the meter 3.

What I claim is In a pressure indicator, an electric circuit including a volt-meter calibrated to'indicate pressures, a conical vessel, diverging Wires Within the said Vessel forming terminais to the said circuit and spaced apart, in#

the lower end of said vessels,and a pipe communicating vwith the upper end of the last named vessel and with thel member which contains the nfluid under thepressure to be indicated. l t

In testimony Wherbof I afx Amy signature in presence of two witnesses. I

i WILLIAM SEYMOUR. Witnesses: 4

GEORGIANA GHACE,

LUTHER V.' MoUL'roN.

sulated supports for said v vires, a second Vessel, a channel of communlcatlon between` 

